diff --git a/app/Livewire/Onboarding.php b/app/Livewire/Onboarding.php
index 606df38..5e05ff9 100644
--- a/app/Livewire/Onboarding.php
+++ b/app/Livewire/Onboarding.php
@@ -3,6 +3,7 @@
 namespace App\Livewire;
 
 use App\Jobs\ArticleDiscoveryJob;
+use App\Jobs\SyncChannelPostsJob;
 use App\Models\Feed;
 use App\Models\Language;
 use App\Models\PlatformAccount;
@@ -286,6 +287,9 @@ public function createChannel(): void
                 'updated_at' => now(),
             ]);
 
+            // Sync existing posts from this channel for duplicate detection
+            SyncChannelPostsJob::dispatch($channel);
+
             $this->nextStep();
         } catch (\Exception $e) {
             $this->formErrors['general'] = 'Failed to create channel. Please try again.';
diff --git a/config/horizon.php b/config/horizon.php
index 34761ea..c8bff54 100644
--- a/config/horizon.php
+++ b/config/horizon.php
@@ -182,7 +182,7 @@
     'defaults' => [
         'supervisor-1' => [
             'connection' => 'redis',
-            'queue' => ['default', 'publishing', 'feed-discovery'],
+            'queue' => ['default', 'publishing', 'feed-discovery', 'sync'],
             'balance' => 'auto',
             'autoScalingStrategy' => 'time',
             'maxProcesses' => 1,